package com.heima.article.service;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.article.mapper.ApArticleConfigMapper;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.service.ApArticleService;
import com.heima.common.freemarker.FreemarkerGenerator;
import com.heima.file.MinIoTemplate;
import com.heima.model.article.dtos.ArticleDto;
import com.heima.model.article.dtos.ArticleHomeDto;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.pojos.ApArticleConfig;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Slf4j
@Service
public class ApArticleServiceImpl extends ServiceImpl<ApArticleMapper, ApArticle> implements ApArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    @Override
    public ResponseResult load(ArticleHomeDto dto) {
        // minBehotTime = 2063
        // publish_time < minBehotTime
        List<ApArticle> apArticles = apArticleMapper.loadArticle(dto, 1);
        return ResponseResult.okResult(apArticles);
    }

    @Override
    public ResponseResult loadmore(ArticleHomeDto dto) {
        // publish_time < minBehotTime
        List<ApArticle> apArticles = apArticleMapper.loadArticle(dto, 1);
        return ResponseResult.okResult(apArticles);
    }

    @Override
    public ResponseResult loadnew(ArticleHomeDto dto) {
        // publish_time > maxBehotTime
        List<ApArticle> apArticles = apArticleMapper.loadArticle(dto, 2);
        return ResponseResult.okResult(apArticles);
    }

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;

    @Autowired
    private ApArticleConfigMapper apArticleConfigMapper;

    @Autowired
    private FreemarkerGenerator freemarkerGenerator;

    @Autowired
    private MinIoTemplate minIoTemplate;

    @Override
    @Async
    public void generate(Long articleId) {
        // 1. 查询ApArticleContent表，获得里面content数据
        LambdaQueryWrapper<ApArticleContent> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ApArticleContent::getArticleId, articleId);
        ApArticleContent apArticleContent = apArticleContentMapper.selectOne(wrapper);
        if (apArticleContent == null) {
            log.warn("文章内容不存在");
            return;
        }

        // 2. 创建一个数据集合Map，把上一步content数据赋值到map的content字段上
        Map<String, Object> map = new HashMap<>(1);
        map.put("content", JSON.parseArray(apArticleContent.getContent()));

        // 3. 调用Freemarker插件，生成HTML页面
        InputStream is = freemarkerGenerator.generate("article.ftl", map);

        // 4. 调用MinIO插件，上传HTML页面
        String url = minIoTemplate.uploadFile("", articleId + ".html", is, "html");

        ApArticle apArticle = apArticleMapper.selectById(articleId);
        if (apArticle == null) {
            log.warn("文章为空");
            return;
        }

        apArticle.setStaticUrl(url);

        // 5. 更新ApArticle，修改里面static_url字段
        apArticleMapper.updateById(apArticle);
    }

    @Override
    @Transactional(rollbackFor = RuntimeException.class)
    public ResponseResult saveArticle(ArticleDto dto) {
        // 1. dto判空
        if (dto == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_REQUIRE);
        }

        Long id = dto.getId();
        String content = dto.getContent();

        // 组装article表数据
        ApArticle apArticle = new ApArticle();
        BeanUtils.copyProperties(dto, apArticle);

        // 2. 判断dto里面的id是否存在
        if (id == null) {
            // 3. 不存在 -> 新增

            // 3.1 插入article表
            int insertResult = apArticleMapper.insert(apArticle);
            if (insertResult < 1) {
                return ResponseResult.errorResult(AppHttpCodeEnum.SERVER_ERROR, "文章新增失败");
            }

            // 3.2 插入article_config表
            ApArticleConfig config = new ApArticleConfig();
            config.setIsDown(false);
            config.setIsDelete(false);
            config.setIsForward(true);
            config.setIsComment(true);
            config.setArticleId(apArticle.getId());
            int configInsertResult = apArticleConfigMapper.insert(config);
            if (configInsertResult < 1) {
                log.warn("文章配置表插入失败");
                throw new RuntimeException("文章配置表插入失败");
            }

            // 3.3 插入article_content表
            ApArticleContent articleContent = new ApArticleContent();
            articleContent.setContent(content);
            articleContent.setArticleId(apArticle.getId());
            int contentInsertResult = apArticleContentMapper.insert(articleContent);
            if(contentInsertResult < 1) {
                log.warn("文章内容表插入失败");
                throw new RuntimeException("文章内容表插入失败");
            }

            // 调用现成的方法，实现文章详情的生成和更新
            generate(apArticle.getId());

            return ResponseResult.okResult(apArticle.getId());
        } else {
            // 4. id存在 -> 修改

            // 4.1 修改article表
            int updateResult = apArticleMapper.updateById(apArticle);
            if(updateResult < 1) {
                return ResponseResult.errorResult(AppHttpCodeEnum.SERVER_ERROR, "文章修改失败");
            }

            // 4.2 修改article_content表
            ApArticleContent contentUpdate = new ApArticleContent();
            contentUpdate.setContent(content);

            LambdaQueryWrapper<ApArticleContent> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(ApArticleContent::getArticleId, id);

            int contentUpdateResult = apArticleContentMapper.update(contentUpdate, wrapper);
            if(contentUpdateResult < 1) {
                log.warn("文章内容表修改失败");
                throw new RuntimeException("文章内容表修改失败");
            }

            // 调用详情生成
            generate(id);

            // 5. 将articleId返回回去
            return ResponseResult.okResult(id);
        }
    }
}
